linux-kernel - [lkp] [fs] e17f2e4fa7: BUG: unable to handle kernel NULL pointer dereference at 0000000000000028

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Date:	Fri, 05 Feb 2016 16:02:14 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Deepa Dinamani <deepa.kernel@...il.com>
CC:	0day robot <fengguang.wu@...el.com>
Subject: [lkp] [fs] e17f2e4fa7: BUG: unable to handle kernel NULL pointer
 dereference at 0000000000000028

FYI, we noticed the below changes on

https://github.com/0day-ci/linux Deepa-Dinamani/Remove-CURRENT_TIME-and-CURRENT_TIME_SEC-PART-1/20160203-141501
commit e17f2e4fa7e7d9e851085009f70902973fe4005e ("fs: btrfs: Replace CURRENT_TIME by current_fs_time()")


+------------------------------------------+------------+------------+
|                                          | 3fa5374a4d | e17f2e4fa7 |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 4          |
| boot_failures                            | 1          | 4          |
| BUG:kernel_test_hang                     | 1          |            |
| BUG:unable_to_handle_kernel              | 0          | 4          |
| Oops                                     | 0          | 4          |
| RIP:btrfs_update_root_times[btrfs]       | 0          | 4          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 4          |
| backtrace:vfs_mkdir                      | 0          | 4          |
| backtrace:SyS_mkdirat                    | 0          | 4          |
| backtrace:SyS_mkdir                      | 0          | 4          |
+------------------------------------------+------------+------------+



[  639.124909] BTRFS info (device vda): disk space caching is enabled
[  639.126317] BTRFS: flagging fs with big metadata feature
[  639.132163] BTRFS: creating UUID tree
[  640.326431] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
[  640.328677] IP: [<ffffffffa003583e>] btrfs_update_root_times+0x1f/0x6b [btrfs]
[  640.330723] PGD 3ef9a067 PUD 3ef80067 PMD 0 
[  640.331879] Oops: 0000 [#1] SMP 
[  640.332892] Modules linked in: btrfs acpi_cpufreq processor
[  640.334252] CPU: 0 PID: 2615 Comm: mkdir Not tainted 4.4.0-00026-ge17f2e4 #1
[  640.335747] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[  640.338035] task: ffff88003efdbc00 ti: ffff88003ea00000 task.ti: ffff88003ea00000
[  640.340030] RIP: 0010:[<ffffffffa003583e>]  [<ffffffffa003583e>] btrfs_update_root_times+0x1f/0x6b [btrfs]
[  640.342441] RSP: 0018:ffff88003ea03d68  EFLAGS: 00010286
[  640.343650] RAX: 0000000000000000 RBX: ffff88003eed2000 RCX: ffff88001db228c8
[  640.345164] RDX: 0000000000000000 RSI: ffff88003eed2000 RDI: ffff88001db33000
[  640.346629] RBP: ffff88003ea03d90 R08: 0000000000000006 R09: ffffffffa001d333
[  640.348080] R10: ffff88003e8eb300 R11: ffffea000076cc00 R12: ffff88001db301b0
[  640.349572] R13: ffff88003eed2000 R14: ffff88001db33000 R15: 0000000000003e44
[  640.351003] FS:  00007f64a4146800(0000) GS:ffff880038600000(0000) knlGS:0000000000000000
[  640.353100] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  640.354384] CR2: 0000000000000028 CR3: 000000003ef76000 CR4: 00000000000006f0
[  640.355852] Stack:
[  640.356635]  ffff88001db22d50 ffff88003e8eb300 ffff88001db301b0 ffff88003eed2000
[  640.358707]  ffff88001db22970 ffff88003ea03e50 ffffffffa004dd5d ffff88003ea03db8
[  640.360831]  0000000000000100 000041ff01ed2000 0000000100000002 0000000000003ea9
[  640.362941] Call Trace:
[  640.363800]  [<ffffffffa004dd5d>] btrfs_new_inode+0x433/0x531 [btrfs]
[  640.365195]  [<ffffffffa004eafc>] btrfs_mkdir+0xb0/0x1c6 [btrfs]
[  640.366577]  [<ffffffff81225518>] vfs_mkdir+0x78/0xa6
[  640.367763]  [<ffffffff81229a18>] SyS_mkdirat+0x7a/0xb1
[  640.369011]  [<ffffffff8122497e>] ? path_put+0x1e/0x21
[  640.370206]  [<ffffffff81229a68>] SyS_mkdir+0x19/0x1b
[  640.371420]  [<ffffffff81a511b2>] entry_SYSCALL_64_fastpath+0x12/0x71
[  640.372810] Code: 00 00 00 00 00 00 48 89 47 40 5d c3 66 66 66 66 90 48 8b 86 90 02 00 00 55 48 89 e5 41 56 49 89 fe 41 55 41 54 41 52 53 48 89 f3 <48> 8b 78 28 e8 97 7c 11 e1 48 8d bb 2c 04 00 00 49 89 c5 49 89 
[  640.378682] RIP  [<ffffffffa003583e>] btrfs_update_root_times+0x1f/0x6b [btrfs]
[  640.380736]  RSP <ffff88003ea03d68>
[  640.381736] CR2: 0000000000000028
[  640.383211] ---[ end trace ed72d9677669a6b4 ]---
[  640.384544] Kernel panic - not syncing: Fatal exception


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Ying Huang

View attachment "config-4.4.0-00026-ge17f2e4" of type "text/plain" (91032 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (14080 bytes)

View attachment "job.yaml" of type "text/plain" (3479 bytes)

Download attachment "reproduce.sh" of type "application/x-sh" (95 bytes)